RichEditDocumentServerExtensions.LoadDocumentAsync(RichEditDocumentServer, String) Method

Asynchronously loads a document from a file. The file format is determined by its content.

Namespace: DevExpress.XtraRichEdit

Assembly: DevExpress.Docs.v24.2.dll

NuGet Package: DevExpress.Document.Processor

Declaration

C#

public static Task<bool> LoadDocumentAsync(
    this RichEditDocumentServer self,
    string fileName
)

VB.NET

<ExtensionAttribute>
Public Shared Function LoadDocumentAsync(
    self As RichEditDocumentServer,
    fileName As String
) As Task(Of Boolean)

Parameters

Name	Type	Description
self	RichEditDocumentServer	Current RichEditDocumentServer instance.
fileName	String	A string that specifies the file to load (including the full path).

Returns

Type	Description
Task<Boolean>	A Task<TResult> object that returns true if the document is successfully loaded; otherwise, false.

Remarks

Important

The RichEditDocumentServerExtensions class is defined in the DevExpress.Docs.v24.2.dll assembly. Add this assembly to your project to use the RichEditDocumentServerExtensions members. You need a license for the DevExpress Office File API Subscription or DevExpress Universal Subscription to use this library in production code.

The format of the document loaded from a file is detected automatically by the built-in IFormatDetectorService service implementation. The following formats are detected:

• DOC, DOCM, DOTX, DOT, DOTM, DOCX, RTF, HTM, HTML, MHT, XML, FlatOpc, EPUB;
• ODT - non-encrypted files only;

Plain text cannot be detected automatically. To load a plain text document, use another method override with DocumentFormat.PlainText as a parameter.

To improve performance, define the format explicitly in the LoadDocument method overloads.

If the format detection fails or the passed string value is null, the RichEditDocumentServer.InvalidFormatException event fires.

After loading a document, the DocumentSaveOptions.CurrentFileName property is set to the file name and the DocumentSaveOptions.CurrentFormat property is set to the detected format.

Use the RichEditDocumentServer.DocumentLoaded event to determine the moment when the document model can be safely modified. Handle the DocumentLayout.DocumentFormatted event to check the loaded document layout.

Important

Take into account the following when you call this method:

• The events fired by this method call may occur in a different thread than the target operation.

• The operation is not thread safe (the document should not be accessed simultaneously by different threads). Wait until the operation is completed before you continue to work with the document (for example, use the await operator).

The code sample below asynchronously loads a document and exports it to the PDF format:

C#

private async void Convert2Pdf()
{
    using (RichEditDocumentServer wordProcessor = new RichEditDocumentServer())
    {
        try
        {
            await wordProcessor.LoadDocumentAsync("Document.docx");
            await wordProcessor.ExportToPdfAsync("result.pdf");
        }
        catch (OperationCanceledException)
        {
            // Your code to handle cancellation
        }
    }
}

VB.NET

Private Async Sub Convert2Pdf()
  Using wordProcessor As New RichEditDocumentServer()
    Try
      Await wordProcessor.LoadDocumentAsync("Document.docx")

      Await wordProcessor.ExportToPdfAsync("result.pdf")
    Catch e1 As OperationCanceledException
      ' Your code to handle cancellation
    End Try
  End Using
End Sub